Only use the integrated built-in charging socket to charge the original EAGTAC 7.4V battery pack. Charging unbalanced third party 7.4V 32650 battery pack, two individual 3.7V 32650 cells, or non-rechargeable batteries may result in battery or flashlight damage.

For backup power use (rechargeable models), you can purchase additional EAGTAC 7.4V battery pack. You can also use two individual 32650 batteries (w/ protection board is highly recommended), but keep in mind that you should not charge any non EAGTAC 7.4V battery pack with the integrated charger.